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Physico-Chemical Characterization of the Groundwater of Kotur

Area Hyderabad, India

Elizabeth Okoyeh*1,2

1 National Geophysical Research Institute, Uppal Road 500007-Hyderabad, India

2 Department of Geological Sciences, Nnamdi Azikiwe University P.M.B. 5025 Awka, Nigeria,

* E-mail of the corresponding author: reallizkay@yahoo.com

Abstract

Significant increase in industries has been observed in Kotur industrial area. Improper disposal of industrial

waste in the area has resulted in water quality deterioration. Water samples were collected from various locations

within the area and analysed for physiochemical parameters using standard methods (APHA) and inductively

coupled plasma–mass spectrometer (ICP-MS) respectively. High level of electrical conductivity, total dissolved

solid, total hardness, calcium, sodium, chloride and magnesium were observed with relationships suggesting

surface input. The concentrations of the cations range from 35 to 309mg/l for Ca, 13 to 106mg/l for Mg, 20 to

311 mg/l for Na and 2 to 8 mg/l for K. 87.5 % of the cations are in the order Ca > Na > Mg > K and Na > Ca >

Mg > K respectively. The anions in the order Cl > HCO3 > SO4 > NO3 were also observed. The high

concentration of the physiochemical parameters reveal surface contamination originating from anthropogenic

sources.

Keywords: Groundwater quality, physiochemical parameters, industrial waste, industrial area, contamination.

1. Introduction

Industrialization and unprecedented population increase have resulted in the generation of large volume of

wastes that are poorly disposed and managed. The impact of indiscriminate waste disposal on the environment

has raised concern in recent times. Improper disposal of chemicals from agricultural, industries, and mining

activities have negative implications on aquatic life and water quality.

The main sources of water pollution include chemical fertilizers, pesticides, untreated sewage and industrial

effluents into rivers, streams and groundwater (Shaik et al. 2012).

Past studies based on the monitoring and evaluation of groundwater sources for drinking and agricultural

purposes (Al-Bassam & Al-Rumikhani 2003; Al-Futaisi et al. 2007; Elango et al. 2003; Jeevanandam et al. 2006;

Pritchard et al. 2008; Subramani et al. 2005; Sujatha and Rajeshwara 2003, Ma et al. 2009) revealed the

importance of groundwater quality assessment in order to protect the highly vulnerable resources. Factors such

as lithology, groundwater flow, nature of geochemical reactions, residence time, solubility of salts, and human

activities affects the concentrations of dissolved ions in groundwater (Bhatt & Saklani 1996; Karanth 1987; Nisi

et al. 2008; Schot & Van der Wal 1992).

Standards are in place for the maximum desirable and permissible limits of most physiochemical parameters in

both surface and groundwater resources for effective management of water quality. The physiochemical

parameters such as pH, TDS and nitrate are important in determining the usage of water for a particular purpose.

While water of low pH is acidic and unsuitable for drinking, high TDS in water renders it unfit for both drinking

and agricultural purposes. The result of the present study indicates that the surface and groundwater resources of

the area are affected by surface contaminants.

The objective of the study is to determine the relationships between water quality parameters and sources of

contamination in Kotur industrial area. For this purpose, samples were collected from different locations chosen

according to their proximity to industrial and agricultural activities. The samples were analyzed for components

such as chloride, nitrate, potassium, sodium, magnesium, calcium, pH, TDS, Total hardness, TOC, and electrical

conductivity (EC)

2. The study area

Kotur industrial area lacks appropriate solid waste disposal system therefore, evaluation of the water quality was

essential. Irrigation farming for the production of tomatoes, pepper, ladies finger, corn, cotton etc abounds and

requires sufficient water supply. The number of industries springing up within the area is on the increase and not

without implication on available resources of fertile soil, surface water and groundwater of the area.

The area lies within Latitude 17005'N to 17

010'N and Longitude 78

015'E to 78

020'E in the southern part of

Hyderabad, India along the Banglore express way. The area is significant in abundant natural resources, fertile

land for agriculture and hence location of an industrial area. It is characterized by an undulating topography with

an elevation of 540 to 610m above msl. The industrial complex is rapidly expanding with attendant increase in

population. The various industries located in the area include pharmaceutical and chemical factories, paper mills,

Journal of Natural Sciences Research www.iiste.org

ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)

Vol.3, No.9, 2013

106

oil, textiles, paints, battery, smelting factories etc. Due to the absence of waste disposal/management facilities,

the solid wastes from these industries are indiscriminately disposed into the environment with consequent effect

on available water supply sources. The geology of the area consist of granite (Archean) that are hard-massive to

foliated and well- jointed, characterized by pink and grey colours. The groundwater occurs at a depth of about

30m in the soil of the weathered and decomposed granite and fractured bedrocks. The groundwater resources of

the area are also significant for irrigation farming for food crops.

3.0 Materials and Methods

The groundwater samples were collected in February 2011 using 1 litre plastic bottles and labeled to avoid

misidentification. Prior to sample collection, the wells were allowed to flow for 5 to 10min to remove stagnant

water from the pipe and avoid contamination and also to ensure that the sample collected is the in-situ

representative of the groundwater quality in the area. The containers were rinsed with the sample to be collected

three to four times before collection to avoid the influence of external contamination. Fig.1 also shows the

distribution of sample locations. 14 groundwater and 2 surface water samples were collected for the purpose of

this study. The analysis for pH, EC, TDS, TOC, TH, Cl-, HCO3

2- NO3

- and SO4

2- was carried out in

Environmental Geochemistry Laboratory of NGRI, India following standard methods (APHA, 1995). The pH

and the EC were obtained using pH meter and conductivity meters respectively. The NO3- and SO4

2- were

analysed using the UV-VIS. Cl- and HCO3

2-were determined by volumetric method by titrating the water

samples against standardized AgNo3 and HCl respectively while TH was analysed by EDTA titration. The total

organic carbon (TOC) present in the water samples were determined using Elementar vario TOC cube. Ca2+,

Mg2+

, Na+, and K

+ were obtained using ICP-MS and the results of the analysis are presented in Table1.

The pH of the water samples ranges from 6.8 to 7.5. pH value of 6.5 is slightly acidic and 8.5 slightly alkaline.

The result suggests neutral water and the values fall within WHO, 2004 (World Health Organization) desirable

limit for drinking water quality.

The EC values obtained from the study varies from 461 to 3430 µS/cm with an average value of 2039 µS/cm. 50%

of the total sample have value above 2000 µS/cm indicating impacts from anthropogenic sources. EC in

groundwater sample shows the presence of dissolved solids and can be used in the derivation of TDS in the

laboratory using suitable multiplication factor. The values obtained for TDS ranges from 295 to 2195 with an

average of 1253. Samples KGW-1, KGW-2, KGW-3, KGW-4, KGW-6, KGW-7, KGW-8, KGW-10, KGW-12,

KSW-1 and KTGW-1 making up about 68.75% of the total samples have TDS values above WHO

permissible limit. According to TDS classification Freeze and Cherry (1979), only 31.25% of the water samples

with TDS <1000 can be grouped under fresh water type. The remaining samples fell into brackish water type.

Total hardness (TH) values for the water samples vary from 190 to 1400 with an average value of 804. The

values exceed WHO permissible limit for drinking water except for samples KGW-5, and KGW-13. From the

result of the field analysis, 81.25% of the water samples are classified as hard water and hardness attributed to

the presence of the paper, textile and chemical industries in the study area.

Chloride concentration ranges from 28 to 1000 mg/l with an average of 453mg/l. The values for samples KGW-1,

KGW-2, KGW-3, KGW-4, KGW-6 and KGW-12 are relatively high but still falls within WHO permissible limit.

High value of chloride in groundwater is often associated with natural processes such as passage of water

through natural salt formation or it may be an indication of pollution from industrial or domestic waste due to

anthropogenic activities (Khan 2001; Rao et al. 2003). The high standard deviation of EC and chloride suggest

that the water chemistry is regulated by external influence.

Nitrate concentration in the water samples varies from 6 to 49mg/l with an average concentration of 32mg/l.

Only 25% of the samples made up of KGW-1, KGW-2, KGW-3 and KGW-9 samples have concentration above

WHO maximum desirable value of 45mg/l. The high concentration of NO3 and Cl- suggest contamination from

external sources such as agricultural activities that is prevalent in the area.

SO4 concentration is below WHO desirable limit (200-400mg/l) for drinking water quality with values ranging

from 3 to 201mg/l and an average of 108mg/l except for KGW-1. 43.75% of the samples have Ca2+

concentration above WHO desirable limit. The concentration of Ca2+

in the water samples varies from 35 to

309mg/l with an average value of 166mg/l and standard deviation of 86mg/l.

High values of Mg2+

ranging from 13 to 106 mg/l were also recorded from the analysis. Samples KGW-3, KGW-

4 and KSW-1 have Na+ concentration values of 235mg/l, 311mg/l and 223mg/l respectively which were above

WHO maximum limit for drinking water quality. Although 81.25% of the total samples have concentration

below WHO standard for permissible limit, Na+ concentration of more than 50mg/l renders the water unsuitable

for domestic purposes.

4.0 Statistical analysis of physico-chemical parameters

A bivariate correlation analysis was applied to describe the relationship between pairs of hydrochemical

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Vol.3, No.9, 2013

107

parameters. A high correlation coefficient (r) with either positive or negative value means a good relationship

between two variables and a value near zero depicts otherwise. In the present study, correlation analysis for the

physicochemical parameters show strong correlation between EC and TDS with all the cations and anions except

TOC, HCO3, NO3 and K with correlation coefficient of 0.07, 0.22, 0.35 and -0.16 (Table 2). Positive correlation

was also observed between TH and all cations and anions except HCO3 and K (correlation coefficient -0.03 and -

0.32). Cl correlated strongly with SO4, Ca, Mg and Na with a correlation coefficient of 0.70, 0.79, 0.85 and 0.82

respectively suggesting possible similar source of enrichment for the parameters. TOC showed very poor

correlation with all the parameters except with pH, HCO3 and K indicating the prevalence of a reducing

environment. The poor and negative correlation of pH with EC and TH may likely suggest the lack of the

influence of industrial activities on groundwater quality.

A scatter plot of the relationship existing between the physiochemical parameters are shown in Fig.1a-e. The r2 =

0.68 in figure 2d indicates that the Total Organic Carbon may have influenced the presence of K in the

groundwater. The TOC is most likely to emanate from the organic manure used in agricultural activities in the

area. Similarly, the plot of Cl- and EC shows a linear plot with r

2 = 0.97 suggesting the influence of Cl

- on EC.

The scatter plot of SO4, Ca2+

, Mg2+

and Na+ against Cl

- revealed r

2 value equal to 0.54, 0.63, 0.76 and 0.68

respectively suggesting increased concentration from a common source.

5.0 Conclusion

Most of the physiochemical parameters have concentration above WHO maximum permissible level in the study

area. High level of electrical conductivity, total dissolved solid, total hardness, Calcium, Sodium, Chloride and

Magnesium were observed with relationships suggesting surface input. The concentration of the cations ranges

from 35 to 309mg/l for Ca, 13 to 106mg/l for Mg, 20 to 311 mg/l for Na and 2 to 8 mg/l for K. 87.5 % of the

cations are in the order Ca > Na > Mg > K and Na > Ca > Mg > K respectively while 68.75% of the anions occur

in the order Cl > HCO3 > SO4 > NO3. The high concentration of anions and cations in most of the samples are an

indication of surface contamination possible from agricultural activities.

Acknowledgements

The authors are grateful to CSIR-TWAS for funding this postdoctoral research work. Unreserved thanks are also

due to the director National Geophysical Research Institute (NGRI) Dr. Rao for providing the enabling

environment for the successful completion of the Fellowship.

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ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online)

Vol.3, No.9, 2013

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d

e

Fig. 2a-e Scatter plot of the physico-

0921 (Online)

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-chemical parameters

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Table 1 Result of physico-chemical analysis Samples Ph EC TDS TOC TH Cl HCO3 NO3 SO4 Ca2+ Mg2+ Na+ K+

KGW-1 6.8 2660 1702 5.32 1400 659 138 48 201 307 100 86 3

KGW-2 7.0 3120 1997 6.32 1360 897 180 49 156 309 92 171 3

KGW-3 7.0 3330 2131 6.49 1300 978 174 48 173 279 94 235 2

KGW-4 7.1 3430 2195 6.80 1180 1000 219 40 174 219 106 311 2

KGW-5 7.0 636 407 3.61 300 53 132 38 21 71 13 20 2

KGW-6 6.9 2330 1491 6.59 1120 620 183 30 130 229 79 75 2

KGW-7 7.0 2130 1363 6.57 950 535 213 20 119 193 74 116 2

KGW-8 7.0 1980 1267 7.84 750 404 258 14 153 142 62 155 3

KGW-9 7.0 1370 877 5.70 710 195 168 48 172 185 35 48 3

KGW-10 7.1 1980 1267 9.80 810 429 288 26 77 117 93 142 2

KGW-11 7.3 1520 973 8.62 630 295 219 26 58 91 74 113 2

KGW-12 7.1 2430 1555 9.61 910 610 294 29 94 126 105 193 2

KGW-13 7.3 1321 845 8.79 510 106 297 41 60 71 42 85 2

KSW-1 7.5 2430 1555 40.14 680 592 336 11 55 107 57 223 8

KTSW-1 7.5 461 295 11.78 190 28 117 6 3 35 17 31 6

KTGW-1 7.3 1687 1080 4.13 670 277 159 44 86 163 41 57 3

WHO STD 6.5-8.5 500-1000 300-600 250-1000 45-100 200-400 75-200 30-100 200 12

Min 6.8 461 295 3.61 190 28 117 6 3 35 13 20 2

Max 7.5 3430 2195 40.14 1400 1000 336 49 201 309 106 311 8

Average 7.1 2051 1313 9.26 842 480 211 32 108 165 68 129 3

STDEV 0.2 871 557 8.51 361 313 66 14 60 86 31 82 2

Table 2 Correlation analysis for the physicochemical parameters

PH EC TDS TOC TH Cl- HCO3- NO3

- SO42- Ca2+ Mg2+ Na+ K+

PH 1

EC -0.4 1

TDS -0.4 1 1

TOC 0.604 0.067 0.067 1

TH -0.66 0.915 0.915 -0.19 1

Cl- -0.41 0.983 0.983 0.053 0.901 1

HCO3- 0.307 0.22 0.22 0.587 -0.03 0.124 1

NO3- -0.52 0.347 0.348 -0.54 0.502 0.299 -0.35 1

SO42- -0.73 0.738 0.738 -0.33 0.855 0.694 -0.14 0.55 1

Ca2+ -0.7 0.791 0.791 -0.3 0.941 0.787 -0.3 0.615 0.885 1

Mg2+ -0.45 0.871 0.871 -0.07 0.854 0.853 0.296 0.228 0.622 0.639 1

Na+ 0.005 0.823 0.822 0.329 0.546 0.816 0.506 0.009 0.401 0.34 0.711 1

K+ 0.641 -0.16 -0.16 0.826 -0.32 -0.13 0.132 -0.53 -0.34 -0.27 -0.35 0.023 1

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